Power requirements back in the early days of mega-tours were a big deal. Some arenas did not have power capacity much in excess of what was necessary for the house lights and PA. An acquaintance in the mobile generating business used to tell stories about when an act like Van Halen came to town they would need to set up several semi-trailers worth of portable diesel generators at the back of the venue to be able to power their light show and amplifiers.
I've often wondered before about this. How do you plug in a big generator set without disturbing the power company? I imagine they would get pissed if all of a sudden they are getting weird frequency or voltage perturbations down the line.
